Strong Coupling between Mechanical Modes in a Nanotube Resonator
Strong Coupling between Mechanical Modes in a Nanotube Resonator
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DOI：
10.1103/physrevlett.109.025503
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发表时间：
2012-07-11
影响因子：
8.6
通讯作者：
Bachtold, A.
中科院分区：
文献类型：
--
作者：
Eichler, A.;del Alamo Ruiz, M.;Bachtold, A.
我们报告的纳米管谐振器的机械模式之间的非线性耦合。在泵-探测实验中揭示了耦合，其中示出了由泵力驱动的模式来修改用探测力测量的第二模式的运动。在第二系列实验中，我们仅用一个振荡力致动谐振器。机械共振的特点是奇异的线形，当测量模式与频率比为2或3的另一模式相当时，会出现可再现的下降、峰值和跳跃。传统的线的形状恢复失谐的频率比使用附近的栅电极上的电压。奇异的线形状归因于机械模式之间的强耦合。控制与栅极电压的耦合强度的可能性，为各种实验，如量子操纵，机械信号处理，和量子到经典跃迁的研究提供了希望。
We report on the nonlinear coupling between the mechanical modes of a nanotube resonator. The coupling is revealed in a pump-probe experiment where a mode driven by a pump force is shown to modify the motion of a second mode measured with a probe force. In a second series of experiments, we actuate the resonator with only one oscillating force. Mechanical resonances feature exotic line shapes with reproducible dips, peaks, and jumps when the measured mode is commensurate with another mode with a frequency ratio of either 2 or 3. Conventional line shapes are recovered by detuning the frequency ratio using the voltage on a nearby gate electrode. The exotic line shapes are attributed to strong coupling between the mechanical modes. The possibility to control the strength of the coupling with the gate voltage holds promise for various experiments, such as quantum manipulation, mechanical signal processing, and the study of the quantum-to-classical transition.